Aristotle noted that when we think carefully about natural causes we see that there are four distinct ways that causes can lead to effects in nature.
When a disease affects the brain-body relationship, the placebo response can confound researchers.
Researchers have long assumed that people think like animals. But now we see that the equation reads the same in reverse: animals think like people.
Watch an acrobat performing on the parallel bars. Or a baseball player pitching a fastball. Or an athlete swimming the butterfly.
No one knows how apoptosis came to be, although there are theories. Even the simplest of animals are programmed for it.